/**
 * 
 * JFreeReport : a free Java reporting library
 * 
 *
 * Project Info:  http://reporting.pentaho.org/
 *
 * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------
 * MemoryByteArrayOutputStream.java
 * ------------
 * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
 */

package com.bit.cfdi.web.utils;

import java.io.IOException;
import java.io.OutputStream;

/**
 * A string writer that is able to write large amounts of data. The original
 * StringWriter contained in Java doubles its buffersize everytime the buffer
 * overflows. This is nice with small amounts of data, but awfull for huge
 * buffers.
 * 
 * @author Thomas Morgner
 */
public class MemoryByteArrayOutputStream extends OutputStream {
  private int maximumBufferIncrement;

  private int cursor;

  private byte[] buffer;

  private byte[] singleIntArray;

  /**
   * Create a new character-stream writer whose critical sections will
   * synchronize on the writer itself.
   */
  public MemoryByteArrayOutputStream() {
    this(4096, 65536);
  }

  /**
   * Create a new character-stream writer whose critical sections will
   * synchronize on the writer itself.
   */
  public MemoryByteArrayOutputStream(final int bufferSize, final int maximumBufferIncrement) {
    this.maximumBufferIncrement = maximumBufferIncrement;
    this.buffer = new byte[bufferSize];
    this.singleIntArray = new byte[1];
  }

  /**
   * Write a portion of an array of characters.
   * 
   * @param cbuf
   *          Array of characters
   * @param off
   *          Offset from which to start writing characters
   * @param len
   *          Number of characters to write
   * @throws java.io.IOException
   *           If an I/O error occurs
   */
  public synchronized void write(final byte[] cbuf, final int off, final int len)
      throws IOException {
    if (len < 0) {
      throw new IllegalArgumentException();
    }
    if (off < 0) {
      throw new IndexOutOfBoundsException();
    }
    if (cbuf == null) {
      throw new NullPointerException();
    }
    if ((len + off) > cbuf.length) {
      throw new IndexOutOfBoundsException();
    }

    ensureSize(cursor + len);

    System.arraycopy(cbuf, off, this.buffer, cursor, len);
    cursor += len;
  }

  /**
   * Writes <code>b.length</code> bytes from the specified byte array to this
   * output stream. The general contract for <code>write(b)</code> is that it
   * should have exactly the same effect as the call <code>write(b, 0,
   * b.length)</code>.
   * 
   * @param b
   *          the data.
   * @throws java.io.IOException
   *           if an I/O error occurs.
   * @see java.io.OutputStream#write(byte[], int, int)
   */
  public void write(final byte[] b) throws IOException {
    write(b, 0, b.length);
  }

  /**
   * Writes the specified byte to this output stream. The general contract for
   * <code>write</code> is that one byte is written to the output stream. The
   * byte to be written is the eight low-order bits of the argument
   * <code>b</code>. The 24 high-order bits of <code>b</code> are ignored.
   * <p/> Subclasses of <code>OutputStream</code> must provide an
   * implementation for this method.
   * 
   * @param b
   *          the <code>byte</code>.
   * @throws java.io.IOException
   *           if an I/O error occurs. In particular, an
   *           <code>IOException</code> may be thrown if the output stream has
   *           been closed.
   */
  public synchronized void write(final int b) throws IOException {
    this.singleIntArray[0] = (byte) (0xFF & b);
    write(singleIntArray, 0, 1);
  }

  private void ensureSize(final int size) {
    if (this.buffer.length >= size) {
      return;
    }

    final int computedSize = (int) Math.min((this.buffer.length + 1) * 1.5, this.buffer.length
        + maximumBufferIncrement);
    final int newSize = Math.max(size, computedSize);
    final byte[] newBuffer = new byte[newSize];
    System.arraycopy(this.buffer, 0, newBuffer, 0, cursor);
    this.buffer = newBuffer;
  }

  /**
   * Flush the stream. If the stream has saved any characters from the various
   * write() methods in a buffer, write them immediately to their intended
   * destination. Then, if that destination is another character or byte stream,
   * flush it. Thus one flush() invocation will flush all the buffers in a chain
   * of Writers and OutputStreams. <p/> If the intended destination of this
   * stream is an abstraction provided by the underlying operating system, for
   * example a file, then flushing the stream guarantees only that bytes
   * previously written to the stream are passed to the operating system for
   * writing; it does not guarantee that they are actually written to a physical
   * device such as a disk drive.
   * 
   * @throws java.io.IOException
   *           If an I/O error occurs
   */
  public void flush() throws IOException {
    if ((buffer.length - cursor) > 50000) {
      System.out.println("WASTED: " + (buffer.length - cursor));
    }
  }

  /**
   * Close the stream, flushing it first. Once a stream has been closed, further
   * write() or flush() invocations will cause an IOException to be thrown.
   * Closing a previously-closed stream, however, has no effect.
   * 
   * @throws java.io.IOException
   *           If an I/O error occurs
   */
  public void close() throws IOException {
  }

  public synchronized byte[] toByteArray() {
    final byte[] retval = new byte[cursor];
    System.arraycopy(buffer, 0, retval, 0, cursor);
    return retval;
  }

  public int getLength() {
    return cursor;
  }

  public byte[] getRaw() {
    if ((buffer.length - cursor) > 50000) {
      System.out.println("WASTED: " + (buffer.length - cursor) + " Length: " + buffer.length);
    }
    return buffer;
  }
}